var turnplate={
    restaraunts:[],				//大转盘奖品名称
    colors:[],					//大转盘奖品区块对应背景颜色
    outsideRadius:192,			//大转盘外圆的半径
    textRadius:155,				//大转盘奖品位置距离圆心的距离
    insideRadius:68,			//大转盘内圆的半径
    startAngle:0,				//开始角度
    randomRate:[],              //控制获奖率，百分制(相加需等于100%)，对应restaraunts(顺序需要保持一致)，
    bRotate:false				//false:停止;ture:旋转
};

$(document).ready(function(){
//动态添加大转盘的奖品与奖品区域背景颜色
turnplate.randomRate = ["50%", '50%', '0%', '0%', '0%', '0%', '0%', '0%', '0%', '0%'];  //小心设置按100%分配
turnplate.restaraunts = ["一等奖", "10猫币", "谢谢参与", "5猫币", "10元免费流量包", "20元免费流量包", "20猫币 ", "30元免费流量包", "100元免费流量包", "2猫币"];
turnplate.colors = ["#FFF4D6", "#FFFFFF", "#FFF4D6", "#FFFFFF","#FFF4D6", "#FFFFFF", "#FFF4D6", "#FFFFFF","#FFF4D6", "#FFFFFF"];


var rotateTimeOut = function (){
    $('#wheelcanvas').rotate({
        angle:0,
        animateTo:2160,
        duration:8000,
        callback:function (){
            alert('网络超时，请检查您的网络设置！');
        }
    });
};

//旋转转盘 item:奖品位置; txt：提示语;
var rotateFn = function (item, txt){
    var angles = item * (360 / turnplate.restaraunts.length) - (360 / (turnplate.restaraunts.length*2));
    if(angles<270){
        angles = 270 - angles; 
    }else{
        angles = 360 - angles + 270;
    }
    $('#wheelcanvas').stopRotate();
    $('#wheelcanvas').rotate({
        angle:0,
        animateTo:angles+1800,
        duration:8000,
        callback:function (){
            alert(txt);
            turnplate.bRotate = !turnplate.bRotate;
        }
    });
};

$('.pointer').click(function (){
    if(turnplate.bRotate)return;
    turnplate.bRotate = !turnplate.bRotate;
    //获取随机数(奖品个数范围内)
    var item = rnd(turnplate.randomRate);
    //奖品数量等于10,指针落在对应奖品区域的中心角度[252, 216, 180, 144, 108, 72, 36, 360, 324, 288]
    rotateFn(item, turnplate.restaraunts[item-1]);
});
});

function rnd(rate){
var random = Math.floor(Math.random() * 100);
var myRandom = [];
var randomList = [];
var randomParent = [];
for(var i = 0; i < 100; i++){
    myRandom.push(parseInt([i]) + 1);
}
for(var i = 0; i < rate.length; i++){
    var temp = [];
    var start = 0;
    var end = 0;
    randomList.push(parseInt(rate[i].split('%')[0]));
    for(var j = 0; j < randomList.length; j++){
        start += randomList[j-1] || 0
        end += randomList[j]
    }
    temp = myRandom.slice(start, end);
    randomParent.push(temp)
}
for(var i = 0; i < randomParent.length; i++){
    if($.inArray(random, randomParent[i]) > 0){
        return(i+1)
    }
}

}


//页面所有元素加载完毕后执行drawRouletteWheel()方法对转盘进行渲染
window.onload=function(){
drawRouletteWheel();
};

function drawRouletteWheel() {    
var canvas = document.getElementById("wheelcanvas");    
if (canvas.getContext) {
  //根据奖品个数计算圆周角度
  var arc = Math.PI / (turnplate.restaraunts.length/2);
  var ctx = canvas.getContext("2d");
  //在给定矩形内清空一个矩形
  ctx.clearRect(0,0,422,422);
  //strokeStyle 属性设置或返回用于笔触的颜色、渐变或模式  
  ctx.strokeStyle = "#FFBE04";
  //font 属性设置或返回画布上文本内容的当前字体属性
  ctx.font = '16px Microsoft YaHei';      
  for(var i = 0; i < turnplate.restaraunts.length; i++) {       
      var angle = turnplate.startAngle + i * arc;
      ctx.fillStyle = turnplate.colors[i];
      ctx.beginPath();
      //arc(x,y,r,起始角,结束角,绘制方向) 方法创建弧/曲线（用于创建圆或部分圆）    
      ctx.arc(211, 211, turnplate.outsideRadius, angle, angle + arc, false);    
      ctx.arc(211, 211, turnplate.insideRadius, angle + arc, angle, true);
      ctx.stroke();  
      ctx.fill();
      //锁画布(为了保存之前的画布状态)
      ctx.save();   
      
      //----绘制奖品开始----
      ctx.fillStyle = "#E5302F";
      var text = turnplate.restaraunts[i];
      var line_height = 17;
      //translate方法重新映射画布上的 (0,0) 位置
      ctx.translate(211 + Math.cos(angle + arc / 2) * turnplate.textRadius, 211 + Math.sin(angle + arc / 2) * turnplate.textRadius);
      
      //rotate方法旋转当前的绘图
      ctx.rotate(angle + arc / 2 + Math.PI / 2);
      
      /** 下面代码根据奖品类型、奖品名称长度渲染不同效果，如字体、颜色、图片效果。(具体根据实际情况改变) **/
      if(text.indexOf("M")>0){//流量包
          var texts = text.split("M");
          for(var j = 0; j<texts.length; j++){
              ctx.font = j == 0?'bold 20px Microsoft YaHei':'16px Microsoft YaHei';
              if(j == 0){
                  ctx.fillText(texts[j]+"M", -ctx.measureText(texts[j]+"M").width / 2, j * line_height);
              }else{
                  ctx.fillText(texts[j], -ctx.measureText(texts[j]).width / 2, j * line_height);
              }
          }
      }else if(text.indexOf("M") == -1 && text.length>6){//奖品名称长度超过一定范围 
          text = text.substring(0,6)+"||"+text.substring(6);
          var texts = text.split("||");
          for(var j = 0; j<texts.length; j++){
              ctx.fillText(texts[j], -ctx.measureText(texts[j]).width / 2, j * line_height);
          }
      }else{
          //在画布上绘制填色的文本。文本的默认颜色是黑色
          //measureText()方法返回包含一个对象，该对象包含以像素计的指定字体宽度
          ctx.fillText(text, -ctx.measureText(text).width / 2, 0);
      }
      
      //添加对应图标
      if(text.indexOf("猫币")>0){
          var img= document.getElementById("shan-img");
          img.onload=function(){  
              ctx.drawImage(img,-15,10);      
          }; 
          ctx.drawImage(img,-15,10);  
      }else if(text.indexOf("谢谢参与")>=0){
          var img= document.getElementById("sorry-img");
          img.onload=function(){  
              ctx.drawImage(img,-15,10);      
          };  
          ctx.drawImage(img,-15,10);  
      }
      //把当前画布返回（调整）到上一个save()状态之前 
      ctx.restore();
      //----绘制奖品结束----
  }     
} 
}